90423019 has 2 divisors, whose sum is σ = 90423020. Its totient is φ = 90423018.

The previous prime is 90423007. The next prime is 90423037. The reversal of 90423019 is 91032409.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90423019 is a prime.

It is a super-2 number, since 2×90423019² = 16352644730148722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (90423059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45211509 + 45211510.

It is an arithmetic number, because the mean of its divisors is an integer number (45211510).

Almost surely, 2^90423019 is an apocalyptic number.

90423019 is a deficient number, since it is larger than the sum of its proper divisors (1).

90423019 is an equidigital number, since it uses as much as digits as its factorization.

90423019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 90423019 is about 9509.1019029139. The cubic root of 90423019 is about 448.8414957639.

The spelling of 90423019 in words is "ninety million, four hundred twenty-three thousand, nineteen".